contact & non-contact

• What are the two types of forces discussed in the video?

  Contact forces and non-contact forces
• How can we describe a force?

  A push or pull acting on an object
• In what unit do we measure force?

  Newtons
• What does a force of five newtons indicate?

  Magnitude of the force exerted
• Why are forces classified as vector quantities?

  They have both magnitude and direction
• What is the key difference between contact and non-contact forces?

  Contact forces require physical touching
• What is an example of a contact force?

  Friction between two touching surfaces
• How does air resistance act as a contact force?

  It requires contact with air particles
• What is tension in terms of contact forces?

  A pulling force exerted through a rope
• What is the normal contact force also known as?

  The reaction force
• How does the normal contact force work with a rock on a table?

  It balances the weight of the rock
• What are the three types of non-contact forces mentioned?

  Gravitational, magnetic, and electrostatic forces
• What is gravitational force?

  Attraction between two objects with mass
• How do magnetic forces behave?

  They can be attractive or repulsive
• What is the nature of electrostatic forces?

  They can also be attractive or repulsive
• How does distance affect non-contact forces?

  The strength decreases as objects move apart
• What are the characteristics of contact forces?

  • Require physical touching
  • Examples include friction, tension, and normal forces
• What are the characteristics of non-contact forces?

  • Do not require physical touching
  • Examples include gravitational, magnetic, and electrostatic forces
  • Act through fields of influence